<i id='QLypO'><tr id='QLypO'><dt id='QLypO'><q id='QLypO'><span id='QLypO'><b id='QLypO'><form id='QLypO'><ins id='QLypO'></ins><ul id='QLypO'></ul><sub id='QLypO'></sub></form><legend id='QLypO'></legend><bdo id='QLypO'><pre id='QLypO'><center id='QLypO'></center></pre></bdo></b><th id='QLypO'></th></span></q></dt></tr></i><div id='QLypO'><tfoot id='QLypO'></tfoot><dl id='QLypO'><fieldset id='QLypO'></fieldset></dl></div>
  • <tfoot id='QLypO'></tfoot>

    1. <small id='QLypO'></small><noframes id='QLypO'>

        <bdo id='QLypO'></bdo><ul id='QLypO'></ul>
      <legend id='QLypO'><style id='QLypO'><dir id='QLypO'><q id='QLypO'></q></dir></style></legend>

      1. 在“for"循环中访问索引?

        Accessing the index in #39;for#39; loops?(在“for循环中访问索引?)

          • <small id='wDSbN'></small><noframes id='wDSbN'>

            <legend id='wDSbN'><style id='wDSbN'><dir id='wDSbN'><q id='wDSbN'></q></dir></style></legend>
            • <bdo id='wDSbN'></bdo><ul id='wDSbN'></ul>

                <i id='wDSbN'><tr id='wDSbN'><dt id='wDSbN'><q id='wDSbN'><span id='wDSbN'><b id='wDSbN'><form id='wDSbN'><ins id='wDSbN'></ins><ul id='wDSbN'></ul><sub id='wDSbN'></sub></form><legend id='wDSbN'></legend><bdo id='wDSbN'><pre id='wDSbN'><center id='wDSbN'></center></pre></bdo></b><th id='wDSbN'></th></span></q></dt></tr></i><div id='wDSbN'><tfoot id='wDSbN'></tfoot><dl id='wDSbN'><fieldset id='wDSbN'></fieldset></dl></div>
                <tfoot id='wDSbN'></tfoot>
                    <tbody id='wDSbN'></tbody>



                  How do I access the index in a for loop like the following?

                  ints = [8, 23, 45, 12, 78]
                  for i in ints:
                      print('item #{} = {}'.format(???, i))

                  I want to get this output:

                  item #1 = 8
                  item #2 = 23
                  item #3 = 45
                  item #4 = 12
                  item #5 = 78

                  When I loop through it using a for loop, how do I access the loop index, from 1 to 5 in this case?


                  Using an additional state variable, such as an index variable (which you would normally use in languages such as C or PHP), is considered non-pythonic.

                  The better option is to use the built-in function enumerate(), available in both Python 2 and 3:

                  for idx, val in enumerate(ints):
                      print(idx, val)

                  Check out PEP 279 for more.




                  Split a Pandas column of lists into multiple columns(将 Pandas 的列表列拆分为多列)
                  How does the @property decorator work in Python?(@property 装饰器在 Python 中是如何工作的?)
                  What is the difference between old style and new style classes in Python?(Python中的旧样式类和新样式类有什么区别?)
                  How to break out of multiple loops?(如何打破多个循环?)
                  How to put the legend out of the plot(如何将传说从情节中剔除)
                  Why is the output of my function printing out quot;Nonequot;?(为什么我的函数输出打印出“无?)
                    <bdo id='Al2S0'></bdo><ul id='Al2S0'></ul>

                          <small id='Al2S0'></small><noframes id='Al2S0'>

                            <tbody id='Al2S0'></tbody>
                            <i id='Al2S0'><tr id='Al2S0'><dt id='Al2S0'><q id='Al2S0'><span id='Al2S0'><b id='Al2S0'><form id='Al2S0'><ins id='Al2S0'></ins><ul id='Al2S0'></ul><sub id='Al2S0'></sub></form><legend id='Al2S0'></legend><bdo id='Al2S0'><pre id='Al2S0'><center id='Al2S0'></center></pre></bdo></b><th id='Al2S0'></th></span></q></dt></tr></i><div id='Al2S0'><tfoot id='Al2S0'></tfoot><dl id='Al2S0'><fieldset id='Al2S0'></fieldset></dl></div>

                            <legend id='Al2S0'><style id='Al2S0'><dir id='Al2S0'><q id='Al2S0'></q></dir></style></legend>

                          • <tfoot id='Al2S0'></tfoot>